Change List for this Rule

 

General Order 95

 

Section IV

 

Strength Requirements for All Classes of Lines

49.1     Poles, Towers and Other Structures

 

A.      Strength (See Rule 48)

 

(1)    Wood poles shall be of sound timber.

 

(2)    In cases where lateral loads on a pole or structure require the use of a guy(s), the pole or structure below the point of the guy attachment shall be considered merely a strut, the guy(s) taking all lateral loads. In such cases, the pole strength requirement shall apply at the point of guy attachment rather than at the ground line.

 

Note:      Revised July 26, 1966 by Decision No. 71009 March 30, 1968 by Decision No. 73813 February 13, 1974 by Decision No. 82466 January 21, 1992 by Resolution SU10January 13, 2006 by Decision No. 05-01-030 and February 5, 2014 by Decision No. 14-02-015.

 

B.      Dimensions

 

The minimum top circumference of wood poles shall be not less than the following:

 

Inches
Grade A Heavy loading district 22
Grade A Light loading district 19
Grade B * Heavy and light loading districts 19
Grade C Heavy and light loading, urban districts 19
Grade C Circuits of 750-7,500 Volts, heavy loading, rural districts 19
Grade C Supply circuits of 0-750 Volts and communication circuits, heavy loading rural districts 16
Grade C Light loading, rural districts 16
* Supply Poles in Grade B construction in rural, light loading districts may have a top circumference not less than 16 inches.
* Communication Poles in Grade B construction at crossings over major railroads may have a top circumferences not less than 16 inches provided such poles meet the specifications of ANSI O5.1-2008.

Note:      Revised February 5, 2014 by Decision No. 14-02-015.

 

C.      Setting of Poles

The depths of pole setting given in
Table 6 are applicable to poles set in firm soil or in solid rock.

Where the resultant bearing surface is not sufficient to prevent overturning or excessive movement of the pole at the ground line, and/or the soil is not firm, deeper settings or other special methods shall be used.

Where poles were set in firm soil, but the soil has since been excavated or subjected to erosion, the minimum embedment shall be no less than 90% of the values specified in
Table 6.

 

Note:      Revised July 26, 1966 by Decision No. 71009, February 13, 1974 by Decision No. 82466, January 19, 1994 by Resolution SU25, October 9, 1996 by Resolution SU40,  January 13, 2006 by Decision No. 05-01-030 and February 5, 2014 by Decision No. 14-02-015.

 

Table 6
Minimum Pole Setting Depths
Total length of pole
(feet)
Depth in soil
(feet)
Depth in Rock
(feet)
20 4 3
25 4 3
30 5 3
35 5 3
40 5 3
45 5 4
50 6 4
55 7 4
60 7 4
65 7 5
70 7 5
75 8 5
80 8 6

 

Note:      Revised March 9, 1988 by Resolution E3076

 

D.      Gains

Gains or equivalent means shall be provided for increasing surface contact of crossarms with round wood poles. Where gains are cut, the depth shall be not less than onehalf inch or more than one inch. Slab gains, metal gains, pole bands, or assemblies of wood or metal supports that provide suitable surface contact and adequate strength are permitted.

 

E.      Replacements (See Rule 44.3 )